Production of colored rubber goods



Patented Feb. 16, 1932 UNITED STATES mmew s-1 RUDOLPH xnnon, or MANNHEIM, GERMAnY;AssIenon "r I. GQQFAJRBENINDUSTRIE V AKTIENGESELLSCHAFT, on FRANKFORT-ON-THE-MAIN, GERMANY, A conrom'rxon' 0F GERMANY PRODUCTION Of COLORED RUBBER GOODS No Drawing: Application filed September 3, 1927, Serial No. 217,528, and in Germany September 4, 1 926.

particularly come into questionheraare in-V applicable because both the soluble dyestuffs and the lakes produced from them are de l,

of lithopone, is mixed with a color lake prestroyed in the vulcanizing operation.

I have now found that triiarylmethane dyestuffs having a sulfo-group in ortho-position to the methane carbon atom, and sulfonic acids or carboxylic acids of anthraqui-none derivatives having at least one free orsub m stituted amino-group constitute exceptions to the general inapplicability of dyestuffs of these kinds, because their insoluble metal salts (lakes) which may if desired be formed on a suitable substratum, produce 'dyeings on rubber which are fast to vulcanization.

The following examples will further il.

lustrate how this invention may be carried out in practice, though it is understood that the invention is not limited thereto;v The parts are by weight;

Example 1 A 85 parts of a rubber mixture containing in 100 parts 60 parts of crude rubber, 1.7 parts of sulfur, 0.6 part of an accelerator, 25 parts of lithopone and 12.7 parts of chalk, are mixed in a roller mixing machine, while warm, with 15 parts of a color lake obtained as follows: 1016 cos. of a neutral suspension of aluminium hydroxide of 2 per cent strength are mixed with a solution of 20 grams of patent blue A (Schultz, Farbstofftabellen, 6th edition, 1923, No. 545, color index 714) in cos. of water. .300 cos. of a 40 solution of barium chlorid of 10 per cent strength are added and the precipitate is filtered off by suction, washed and dried. A

hollow body formed from this colored mix-;

ture is Vulcanized in theusual manner in the iron mould by application of steam at 3 atmospheres pressure for 0 minutes. The vulcanized product is greenish blue.

E wample 2 A rubber mixture as basis containing in 100 parts 74 parts of light colored crude rubber, 2.5 parts of sulfur, 2.2 parts of an accelerator, 13 parts of zinc white and 8.3'parts yields ablue vulcanized sheet.

- What Iclaim isz,

1. The process of producingvulcanized colored rubber goods, which comprises in-, a

corporating with the rubber prior to vulcanization an insoluble bariumsalt of patent blue A and then Vulcanizing the rubber.

' 2. As new articles I of manufacture vulcanized colored rubber. goods obtainable-by incorporating with the rubber prior to vulcanization an insolule barium salt of patent blue A, and then vulcanizing.

3. The process of producing vulcanized colored rubber goods, which comprises in- ,corporating with the rubber prior to vulcanization, an insoluble metal salt ofan acid 1 dyestuff of the triarylmethane dyestuif series having a sulfo group in ortho-position t0 the methane carbon atom, and then vulcanizing the'rubber. v i i n 4:. As new articles of manufacture vulcanized colored rubber goods comprising an insoluble metal salt ofan acid dyestuff of I the triarylmethane dyestufi' series having a sulfo group in ortho-position to the methane carbon atom, and then vulcanizing.

5. As new articles of manufacture blue vulcanized rubber goods comprising rubber, a water-insoluble metal salt of patent blue A and a finely divided filler.

6. As new articles of manufacture blue vlucanized rubber goods comprising rubber, from 8 to 10 per cent its Weight of a waterinsoluble barium salt of patent blue A and from 44 to 83 per cent of a filler.

7. As new articles of manufacture blue vulcanized rubber goods comprising rubber, from 8 to 10 per cent its weight of a Waterinsoluble barium salt of patent blue A and from 44 to 83 per cent of a finely divided colourless filler. V

In testimony whereof I have hereunto set my hand. RUDOLPH KRECH. 

